Because Tokyo is an urban heat island, it traps heat, making conditions worse for athletes and residents. The forecast is bad enough on its own. This could be the hottest Olympic games on record.

It’s predicted that 68% of the world's population will live in urban areas by 2050. While cities offer jobs and prosperity, among other alluring things, their growth doesn’t come without a cost.

John Legend, Keith Urban, Angélique Kidjo, Alejandro Sanz and the Suginami Junior Chorus performed 'Imagine' in a pre-recorded video at the opening ceremony of the Tokyo Olympics ...